So Many Coolants, So Little Time

Everyone who owns a car is familiar with that green liquid that is poured into your car to keep it from overheating. That green liquid is the symbol for antifreeze, and like other coolants, it is used to remove heat. Antifreeze is poured into a reservoir and is then distributed to the radiator to help keep the engine cool. There are many different brands and types and you may be confused about which one to put in your car for the winter. To keep your car in safe and reliable service, it is important to know the differences between the types of coolants so that you can make the best choice to get the performance you need out of your car for the cold months.

Type 1: Propylene Glycol

The most common type of antifreeze is propylene glycol. This substance is organic and it not as toxic as ethylene glycol. It is becoming more popular as an engine coolant because of its less toxic nature. It is also added to other items such as ice cream, baked goods, and a number of processed foods. The major drawback to using this coolant is that it oxides when it is exposed to heat and air to form lactic acid. If the growth of lactic acid is not prohibited, it could form corrosion in the cooling system. The organic nature of this mixture is also prone to form a bacterial slime, which accelerates the rate of corrosion. If you use this type of antifreeze, you should make a conscientious effort to keep a close eye on the cooling system and check for color change, bacterial slime, and corrosion. If the color turns reddish, it is time to change the fluid. 

Type 2: Ethylene Glycol

Ethylene glycol is colorless, odorless, and viscous in its pristine form. It has a sweet taste but it can be toxic to humans and animals if taken internally. Because it is colorless, odorless, and has a sweet taste, manufacturers have purposely added coloring to the mixture to emphasize its potential for harm in case of accidental ingestion. Ethylene glycol is slowing falling out of favor as a coolant because of its toxicity level, but it displays a higher boiling point so that it could be used in all seasons. If this fluid appears to be dirty, be sure to drain out the old fluid and replenish with fresh.

Type 3: Extended Life

Extended life antifreeze is a coolant that has additives in the mixture to provide protection against rust, corrosion, and other related damage. That means that the coolant should last longer and stay serviceable longer than standard antifreeze. Most formulas are made with ethylene glycol and it is usually light orange in color. Like the other formulas, it is mixed with water before it is added to the coolant reservoir. If you are unsure about what antifreeze you should be using, you should ask your mechanic or automotive professional. Check your car manual to find the recommended type and the timeframe in which the fluid checks are performed. The label on the bottle will tell you how to mix the antifreeze with the water before you add it to your car.